Joint.



E. BERLINER.

JOINT.

APPLIOATION FILED AUG. 11, 1908.

Patented July 6, 1909.

BEST AVAILABLE one? EMILE BERLINER, or WASHINGTON, DISTRICT OF COLUMBIA.

JOINT.

, Specification of Letters Patent.

."Fatented July 6, 1909.

Application filed August 11 1908. Serial No. 447,950.

To all whom it m y concerm. V

Be i known that I, EMILE-BERLINER, a citizen .of "the United States,-residing at Washington, inthe District of Columbia, have inventedcertain new, and useful Improvements in Joints,of-which'the following 1sa descriptio'n reference being had to the accompanying drawing and tothe letters of reference marked thereon.

- My invention relates to an improvement in joints for the partsofframing and especially for cross cylindrical braces.

My invention has been especially designed for use in connectionwithflying machines. The framework of such machines must of necessity, bevery light, but of great strength. The material best adapted thereforfor strength and lightness, is bamboo, which comes in long cylindricalstri s. By reason of their shape, it i s very difiicult to rigidlysecurethese strips together at the places where they mustcross and the objectof my invention is to provide a means for securing such pieces togetherattheir crossing, although it will be understood thatthe invention isapplicable to, other material than ba1nboo.-

The invention therefore, consists in the matters hereinafter describedandireferred to in the appended claims.

The invention is illustrated i'n thc accompanying ,drawmgs in whichFigure 1 is a side view illustrating the first step in the operation offorming the joint Fig. -2is a similar view illustrating the seeond step;and- Fig; 3 is a view illustrating 1 tubes atLtheir point of crossing, abolt, 41 or.

the third step;

In these drawings, A represents two bamboo strips which are to be unitedat their point of crossing. I first passthrough the naiLo'r screw'totemporarily hold them in proper position, although. it will beunderstood that said step is not. absolutely essensfitial. I then applyin a semi plastic condition around the joint in suflicient, quantity, amixture ofshellac or other resinous substance, with a filler of oxid ofiron or another oxid such as bariumoxid or baryta,

sulfate of lead or zinc, or similar mineral substances, and a. fibrousmaterial, such as Wool or cotton flock. The shellac or other resinoussubstance, acts as a binder, the mineral substance as a filler, and thewool or cotton flock, as a fibrous 'strengthener. The mixture is formedin substantially the proportion of 5%, 10 and 1, respectively, of

resmous substance, filler and fibrous substance by weight. Such amixture is soft when heated and very toughfland hard when cold. A wad ofthis mixture is softened by heat and placed around the joint as shown inband pressed into place filling all the interstices in the material.Before it is cool and therefore hard, tape or cord or other suitablebinding material, as shown at c, is tightly wound around it and thebamboo, to

press and hold the substance in place, and I when cooled, the mixturebecomes .very. I

hard, and an absolutely secure and rigid joint is formed.

While I have described the use of the tape or cord, it will beunderstoodthat this may be dispensed with, although it aids in forcing thesemi-plastic mass intothe interstices of the wood, and also acts as acover to prevcnt breaking of the mixture, whichbecoines somewhatbrittle,when cool.

Having thus articular-1y described my invention, What claim as new anddesire to secure by Letters Patent is 1. A joint for cross bars,including a securing material of a resinous compound pressed around thejoint; 1

2. A joint for cross bars including a se curing material, consisting ofa resinous sub-- stance and a fibrous substance pressed around thejoint.

3. A joint for crossbars including a securing material consisting of aresinous sub stance and a mineral substance pressed around the joint.

.4. A joint for. cross bars, including a securing material com osed of aresinous compound containing a Her, and a fiber pressed around the jointand a binding cord or tape encircling the same.

5. A joint comprising the cross bars, a se- 0 mixture surrounding thesame, coniwhen cool, and finally binding the joint with poseofshellac,oxidofiron, and flock pressed ta e or the like. V nto shapearound the joint. in testimony whereof I afilx my signature, 6. Therocess of uniting cre'ss bars, conin presence of two witnesses. 5sisting in t holding them in position, then EMILE BERLINER. surroundingthe joint with a warm semi- Witnesses:

plastic mixture of suitable material, sub-. A. M. PARKINS, stantially asdescribed, which becomes hard] C. L. STURTEVANT.

